1-second-resolved strain mapping in Ti-6Al-4V alloys during dwell fatigue in SEM by video sampling moiré

Qinghua Wang, Shien Ri, Akira Maenosono, Yoshihisa Tanaka, Motomichi Koyama

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Towards clarifying underlying behavior of dwell fatigue in Ti alloys, we here present the first example of 1 second- and 1 μm-resolved full-field dynamic strain mapping. It has been realized by developing a video sampling moiré method combined with a video acquisition way in a scanning electron microscope (SEM). Monotonic strain increments during displacement holding for 10 min in dwell fatigue are visually characterized in both smooth and cracked Ti-6Al-4V specimens. The strain rates from 10 −6 to 10 −5 s −1 of average and maximum strains, as well as the remaining plastic strain were experimentally measured in both specimens. The strain distributions are coupled with grain boundaries to discuss the strain evolution characteristics. Experimental results indicate that both crack initiation and growth in the Ti-6Al-4V alloy are sensitive to even several tens of second-scale load/displacement holding.

Original languageEnglish
Pages (from-to)63-70
Number of pages8
JournalMechanics of Materials
Volume133
DOIs
Publication statusPublished - Jun 1 2019

Fingerprint

dwell
Electron microscopes
electron microscopes
sampling
Fatigue of materials
Sampling
Scanning
scanning
strain distribution
crack initiation
strain rate
acquisition
plastics
grain boundaries
Crack initiation
Strain rate
Crack propagation
Plastic deformation
Grain boundaries
titanium alloy (TiAl6V4)

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Materials Science(all)
  • Mechanics of Materials

Cite this

1-second-resolved strain mapping in Ti-6Al-4V alloys during dwell fatigue in SEM by video sampling moiré. / Wang, Qinghua; Ri, Shien; Maenosono, Akira; Tanaka, Yoshihisa; Koyama, Motomichi.

In: Mechanics of Materials, Vol. 133, 01.06.2019, p. 63-70.

Research output: Contribution to journalArticle

Wang, Qinghua ; Ri, Shien ; Maenosono, Akira ; Tanaka, Yoshihisa ; Koyama, Motomichi. / 1-second-resolved strain mapping in Ti-6Al-4V alloys during dwell fatigue in SEM by video sampling moiré. In: Mechanics of Materials. 2019 ; Vol. 133. pp. 63-70.
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